title: Photo-acoustic detection on electronic quenching rate constants of NO excited states.
abstract: The electronic quenching rate constants of NO A(2)Σ (υ'=0, 1), E(2)Σ (υ'=2, 3, 4) and F(2)Δ (υ'=1, 2, 3) states by gas air are reported. The experiments were carried out by measuring the total fluorescence intensity of A(2)Σ (υ'=0, 1)→X(2)Π (υ″) transition at various air pressures. It gives the Stern-Volmer plots. The quenching rate constants of A(2)Σ (υ'=0, 1) states are obtained from the slope of Stern-Volmer plots and the known radiative lifetime. Based on the primary results of the work, we have measured the quenching rate constants of high excited E(2)Σ (υ'=2, 3, 4), F(2)Δ (υ'=1, 2, 3) states for the first time with the technique of photo-acoustic (PA) spectroscopy. It is shown that the electronic quenching rate constants of NO E (υ') and F (υ') states are in the order of 10(-10)cm(3)/molecules. They are much larger than those of A(2)Σ (υ') state, whose rate constants are in the order of 10(-13)cm(3)/molecules. For E (υ') and F (υ') states, it is also found that the quenching rate constants increase with the vibrational energy levels. Similar result has been reported also for A(2)Σ (υ'≥2) states in existing literatures. The agreement indicates the potential use of PA spectroscopy for measuring the electronic quenching rate.
authors.affiliation: School of Mathematics and Physics, North China Electric Power University, Baoding 071003, China. gyzhang65@yahoo.com.cn
authors.forename: Guiyin
authors.initials: G
authors.lastname: Zhang
authors.forename: Yidong
authors.initials: Y
authors.lastname: Jin
mesh_terms: D000162:Acoustics; D004583:Electrons; D005453:Fluorescence; D007700:Kinetics; D007834:Lasers; D008027:Light; D008968:Molecular Conformation; D009569:Nitric Oxide / Q000737:chemistry*; D011312:Pressure
chemical_list: D009569:Nitric Oxide